See links below
1. http://www.chemistryland.com/PolymerPlanet/Polymers/PolymerTutorial.htm
2. https://www.youtube.com/watch?v=nRsS0rqoKeQ&feature=fvsr
3. https://www.youtube.com/watch?v=8b_3T7Ss4_M&feature=related
4. http://matse1.matse.illinois.edu/polymers/time.html
5. http://www.cmu.edu/gelfand/k12-teachers/polymers/natural-synthetic-polymers/